[논문]Zero reduction luminescence of aqueous-phase alloy core/shell quantum dots via rapid ambient-condition ligand exchange

Le, Thanh-Hai; Kim, Semin; Chae, Subin; Choi, Yunseok; Park, Chul Soon; Heo, Eunseo; Lee, Unhan; Kim, Hyungwoo; Kwon, Oh Seok; Im, Won Bin; Yoon, Hyeonseok

doi:10.1016/j.jcis.2019.12.104

[해외논문] Zero reduction luminescence of aqueous-phase alloy core/shell quantum dots via rapid ambient-condition ligand exchange

Journal of colloid and interface science, v.564, 2020년, pp.88 - 98

Le, Thanh-Hai (Department of Polymer Engineering, Graduate School, Chonnam National University) , Kim, Semin (Department of Polymer Engineering, Graduate School, Chonnam National University) , Chae, Subin (Department of Polymer Engineering, Graduate School, Chonnam National University) , Choi, Yunseok (Department of Polymer Engineering, Graduate School, Chonnam National University) , Park, Chul Soon (Department of Polymer Engineering, Graduate School, Chonnam National University) , Heo, Eunseo (Department of Polymer Engineering, Graduate School, Chonnam National University) , Lee, Unhan (Department of Polymer Engineering, Graduate School, Chonnam National University) , Kim, Hyungwoo (Alan G. MacDiarmid Energy Research Institute, School of Polymer Science and Engineering, Chonnam National University) , Kwon, Oh Seok (Infectious Disease Research Center, Korea Research Institut) , Im, Won Bin , Yoon, Hyeonseok

Abstract ▼ AI-Helper

Abstract Quantum dots (QDs) have been widely studied as promising materials for various applications because of their outstanding photoluminescence (PL). Although ligand exchange methods for QDs have been developed over two decades, the PL quantum yield (QY) of aqueous phase QDs is still lower than that of their organic phase and the mechanism of quenching has not been clearly understood. In this study, we demonstrate for the first time that 3-mercaptopropionic-capped CdZnSeS/ZnS core/shell QDs obtained via ligand exchange in a ternary solvent system containing chloroform/water/dimethyl sulfoxide can enable the fast phase transfer and zero reduction of PL under ambient condition. The new solvent system allows the ligand-exchanged QDs to exhibit enhanced QYs up to 8.1% of that of the organic-phase QDs. Based on both theoretical calculation and experiment, it was found that control over the physical/chemical perturbation between the organic/aqueous phases by choosing appropriate solvents for the ligand exchange process is very important to preserve the optical properties of QDs. We believe that our new technologies and theoretical knowledge offer opportunities for the future design and optimization of highly stable and highly luminescent aqueous-phase QDs for various applications. Graphical abstract [DISPLAY OMISSION]

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